> From: Philippe Verdy <[email protected]>
> Date: Thu, 15 Nov 2012 08:34:25 +0100
> Cc: Eli Zaretskii <[email protected]>, Jeff Senn <[email protected]>, 
>       Unicode Mailing List <[email protected]>
> 
> In a WYSIWYG edited document, where the editing view can show BOTH the left
> and right margin of the intended page (or where automatic linewraps are
> generated, such as most HTML pages in a web browser that displays an
> editable text field), and where no horizontal scrollbar is needed for the
> editable field view, all lines of the paragraph are completely displayed,
> the UBA algorithm is applied line by line, and the two carets are always on
> the same rendered line. They can always be made BOTH visible at the same
> time on that line, each one showinf its correct direction (with their arrow
> head).

Some editors, such as Emacs, can enable and disable wrapping at user
command.  So the wrapped-line assumption might not hold, and does not
hold in some specialized modes.

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